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R-22 replacements

I was wondering what how well the R-22 replacement refrigerants work. I have a walk in cooler at my cabin which developed a leak at a flare over the summer and rather than shelling out the dough for a cyl. of the real stuff I thought I'd try the replacement. (at about half the cost) Also wondering how the operating pressures compare. Thanks.

MO99/438a is the closest as far as properties/pressures, but there is no "drop-in" you can top off 22 with a secondary gas. It will only save you 20 or 25 percent, though. DuPont has a video on YouTube with more info.

Because Coolant Express 22a Refrigerant is so efficient you will use up to 40% less! Please see equivalencies below.

The 30 lb cylinder = 12 lbs of Coolant Express Refrigerant and is EQUIVALENT to 30 lbs of R22a

The 50 lb cylinder = 20 lbs of Coolant Express Refrigerant and is EQUIVALENT to 50 lbs of R22a
Each ounce of Coolant Express 22a Refrigerant is equivalent to 2.5 ounces of R22.

MANY years ago, in the 1990's, I was doing 134a conversions on R12 systems in cars. The guideline was that you could only charge 80% of the weight of the R12 system label value once you had replaced the receiver or accumulator (depending on the system) and drained out whatever oil you could.